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<< ニセコなだれ情報 第79号 Niseko Avalanche Info No.79 | main | ニセコなだれ情報 第81号 Niseko Avalanche Info No.81 >>
ニセコなだれ情報 第80号 Niseko Avalanche Info No.80

山麓6時-5度降雪10cm、モイワ800m-6.4度東0.5m降雪20cmおだやか、アンヌプリ1150m-8度風弱く降雪10cm、ヒラフ1250m-10度風弱くおだやか、降雪15cm、日本海弁慶岬南4m/s、神威岬南東2m/s気圧1016hPa波高0.5m、

 

海上、山ともに穏やか。質の良い低気圧前面降雪が薄く山を覆っているが雪庇ふきだまりの発達はない。観察から全体の雪崩リスクは低い。急斜面ではこの雪による流れ型の浅い表層雪崩が出やすいので注意。トラックは充分には隠れていないが雪は良い。

 

各山頂ゲートは開けられる予定。パトロールの意見を聞き準備してコース外へ出ること。現在の積雪表面は 次の降雪下で雪崩発生面となる見込み。この層は温度勾配がやや大きい霜系の2月22-23日層となる可能性がある。深部各層は安定しているが北向きの急斜面では2月21日層(ふきだまり内部不連続面)からの雪崩の可能性があるので注意。

 

モイワクワッドリフト故障のため見返り方面の滑走は出来ない。しばらくお待ちを。今冬の多量の降雪で風下斜面に亀裂が多数生じている。亀裂は上からは見えないので注意。3月に入ると標高1100m鉱山の沢側壁やアンヌプリ大沢雪庇斜面からの全層雪崩の危険が急激に高まる。谷底を滑ってコースに戻る習慣は改めるべき。特にガイドや経験者は安易に初心者を谷底に誘導してはならない。午後から天気は崩れる。天候急変による視界不良や強風に注意。良い一日を。

 

Niseko base 6.00am: -5°, 10cm new snow. Moiwa 800m: -6.4°, E0.5m/s, 20cm new snow, calm. Annupuri 1150m: -8°, light wind, 10cm new snow. Hirafu 1250m: -10°, light wind, calm, 15cm new snow. Coastal data: Benkei Cape: S4m/s. Kamui Cape: SE2m/s, 1016hPa, wave 0.5m.

 

The sea and mountains are both calm. The mountain has a thin cover of good quality pre -low pressure snowfall. No notable cornice or snowdrift development. From observation the general avalanche risk is low. Be careful today on steep slopes, flowing shallow surface avalanches occur easily with this type of snow. Although yesterdays tracks are not covered, snow condition is good.

 

Peak gates are expected to open. Please listen to the patrols advice and be prepared before going out of bounds. The current snow surface is expected to become a fracture face in the future snowpack. This 22-23rd layer has a large temperature gradient and frost within. Deeper layers are stable however there is possibility of avalanches on steep north facing slopes (inconsistent snowdrift development) from 21st Feb layer.

 

Moiwa quad lift is broken so cannot ride Mikaeri area, should be good snow when its fixed! The heavy snowfall this winter is causing many cracks to open on leeward slopes. Be careful they cannot be seen from above. Entering March the risk of full depth avalanche at Kozan no sawa 1100m and Osawa cornice slope is rapidly increasing. Think about whether your habit of riding back to the ski area in the valley bottom is worth getting taken out by a massive tree, rock and mud laden avalanche. Guides and experienced riders especially should reconsider taking beginners these routes. The weather is expected to deteriorate this afternoon. Be careful of change in weather, bad visibility and strong winds. Have a good day

| - | 07:43 | - | - | pookmark |